Below is a link to the award-winning 2004 documentary Paper Clips, the story of a middle school in a small town in Tennessee that began a project to teach its homogenous student body about diversity and the Holocaust. It’s really quite interesting, in the documentary way.
I recommend you take the time to view it, though it is 82 minutes.
The video is made possible through a new web service called SnagFilms that features documentaries in full for free, though with some annoying but quite brief advertisements. It looks promising.